Best way to get a bed back in a bag is to have your bed upside down (handles to lift your bed on the floor) an put the bag on over the top then move it round as you do up the zip.
The bag is so important if your mobile an slide your bed over your back seats as the seat belt plugs will ruin your bed, trust me I'm now on my 3rd bed in 2 years because if not putting it back in its bag.
I've got a lightweight bed from feel good.uk. It's lightweight, easily portable, very sturdy, easily adjustable etc etc, would highly recommend.
With regards to putting it up an down, I find easy to do on my own providing you've got room, open it out so it's on it's side then using your foot as a lever pull the bed up on to its 4 legs.
To pop it down I hold the handles on the side of the bed an in a swift movement lift the handles upwards so the bed tips up on its side an folds together. Really quick & easy.
When u have clients that can't help you put up your table for various reasons its good to know how to do this on your own.
Xxxxxx